Index: wp-includes/ms-functions.php
===================================================================
--- wp-includes/ms-functions.php	(revision 23297)
+++ wp-includes/ms-functions.php	(working copy)
@@ -866,11 +866,10 @@
 		if ( isset( $user_already_exists ) )
 			return new WP_Error( 'user_already_exists', __( 'That username is already activated.' ), $signup);
 
-		wpmu_welcome_user_notification($user_id, $password, $meta);
+		wpmu_welcome_user_notification( $user_id, $password, $meta );
 
-		add_new_user_to_blog( $user_id, $user_email, $meta );
-		do_action('wpmu_activate_user', $user_id, $password, $meta);
-		return array('user_id' => $user_id, 'password' => $password, 'meta' => $meta);
+		do_action( 'wpmu_activate_user', $user_id, $password, $meta );
+		return array( 'user_id' => $user_id, 'password' => $password, 'meta' => $meta );
 	}
 
 	$blog_id = wpmu_create_blog( $signup->domain, $signup->path, $signup->title, $user_id, $meta, $wpdb->siteid );